[vtkusers] vtk ProbeFilter extremely slow on 3D grid

[peterm]

Dear all,

I am trying to convert a vtkUnstructuredGrid to a vtkUniformGrid so that it
can be exported and volume rendered in another non vtk application. I am
using vtkProbeFilter with the unstructured grid reader as source and a 3D
uniform grid as input.

The interpolation works, but it takes extremely long  to evaluate, in the
range of several minutes for a relatively small output volume (61 x 61 x
109).

My question is if there is a more efficient way to do the conversion (by
using something else than vtkUniformGrid for example for the sampling) so
that the execution time can be lowered to a reasonable level (a few seconds
max)?

Thanks,
Peter

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